Means for removing heat indicator bulbs



July 16, 1940.

B. STRONG MEANS FOR REMOVING'HEAT INDICATOR BULBS ,Filed June 17, 1938Patented July 16,1940 a 2,208,520

UNITED STATES PATENT OFFICE Basil Paul Strong, Atwater, Ohio ApplicationJune 17, 1938, SeriakNo; 214;345.

4 Claims. (Cl. 29-881) My invention relates to means for and adescription proceeds, the invention consists in method of removing heatindicator bulbs from the novel-" features hereinafter described in dethemotor head casting of automobiles or the like. tail; illustrated in theaccompanying drawing The heat indicator bulbs used on automobile andmoreparticularly pointed out in the ap- 5 engines are immersed in a body ofwater or other pended claims.

motor cooling liquid and the impurities in the In the drawing: coolingliquid build up a residue which corrodes Fig. 1 is a section of themotor head casting the bulb and the motor head casting at their linewith my device shown in place.

of contact, causing the bulb to adhere or freeze Fig. 2 is a sideelevation of the frame of my 16 to the casting, thus resisting the readyremoval device.

of the bulb from the casting. Heretofore one Fig. 3 is an enlargedsection at 3-3 of th method used to remove the bulb has been to inlowerend. of the frame. sert a tool through an adjacent opening in the Fig. 4is a plan view of theupper end of the motor head casting and with itpress against the lever.

15 end of the bulb, but owing to the angular position Fig. 5 is anelevation of the lower end of the of thecenterline of the bulb withrespect to the lever s w ng sem -s c ecesse tofi the centerline of theopening, in some cases 45 deinner end of heat: indicator bulbs ofdifferent grees, such pressure when applied sets up a bendsizes. ingmoment in the bulb, which, having a thin In the particular. embodimentof my invention {if} fragile shell of soft metal, is dentedor bent and.shown. in the above. drawin l de i tes a D distorted in such a manner asto render the bulb tion of an automobile motor head casting, havingineffective for further use. Another common a nipple 2 about which fitsahose 3 leading from method of attempting to loosen and remove the themotor head to radiator not shown. Hollow bulb from its seat in thecasting, is to pull on the portion t of the motor head casting forms aindicator tube attached to the bulb, which results chamber for the.motor cooling liquid; 5 is a 25 in either breaking the tube or in sodistorting it heat indicator bulb consisting of a thin closed as torender the reading on the automobile dash shellhavinga semi-sphericalinner end Band an indicator out of calibration. outer end 11 throughwhich indicator tube 8 ex- The object of my invention is to eliminatetends from bulb. 5* up to an indicator dial (not 5 these troubles and toprovide a method of and shown.) usually loca on the instrumentpanelmeans for forcing the heat indicator bulb out of ,on t'he dash of an:automobile.

its bearing in the motor head casting by means The. bulb: is insertedinto the cooling chamber of pressure exerted in a direct line with theof the head. casting where it is immersed in the longitudinal axis ofthe bulb thus avoiding the cooling liquid and is held in place bythreaded any distortion of the latter. outer end of bulb against a seatin the motor A further object is to provide a simple tool head casting;thussealing it against any leakage wherein the shape of that portion ofthe tool of cooling fluid from the chamber of the head which contacts orbears against the inner end-of casting.

5 setting up of any bending action in the bulb and retaining nutHllwhichpresses the shoulder II on the bulb, will conform accuratelywith the shape l2 designates the main frame or stationary of the end ofthe bulb so as to distribute presjaw oil my device which is provided atits lower sure applied to such end uniformly over the area e d-'w t y p(Figs- 2 and pted of contact to prevent any deformation of the toreadily fit down over the tube 8 and to conshape of the bulb; as it hasbeen found that tact theouter surface ofretaining nut Hi. On

-5 even a slight dent in the shell of the bulb will the forked portionof the frame I2 I provide an render the entire heat indicating systeminarch-shaped projection l3' which is adapted to effective. fit into thehole in nut l0 between the nut and A further object is to provide amethod wherethe tube so as to=hold the frame in place and: by the heatindicating bulb may be removed prevent it from turning when the pressureis apafter my tool is applied, by simply turning out plied in turningnut l0 out of its position. 50 the retaining nut which is used normallyto keep Through a hole in the upper end of frame I2, I the bulb heldtightly against its seat in the motor insert pin l4 upon which movablelever or jaw head casting. I5 is pivoted for free oscillation. At theupper With the foregoing objects outlined and with end of frame I2, Ialso provide an integrally other objects in view which will appear asthe formed boss l6 which has a threaded hole 55 bulb and the verticalcenter-line of the nipple 2.

In using my method and device for removing a bulb from the motor, theretaining nut 10 is loosened slightly with an ordinary hand wrench, thenmy device is placed in theposition shown in Fig. 1; the adjusting screwI1 is tightened down lightly with the fingers, thenlnut H1 is unscrewedthus exerting outward pressure against the lower end of frame I2. Thispressure is transferred through frame 12 and lever I to the rear end ofbulb in a direction coincident with its longitudinal axis, thus forcingthe bulb loose and out of the motor head casting without setting up abending moment in the bulb or otherwise denting or injuring it.

From the foregoing, it is believed that the construction, operation andadvantages of my improved tool will be readily understood by thoseskilled in the art, and I am aware that changes may be made in thedetails disclosed without departing from the spirit of the invention asexpressed in the claims.

What I claim and desire-to secure by Letters Patent is: v

-1. A tool of the character described for re-. moving heat indicatorbulbs of the type arranged in an opening in a water jacket or the likeand held by a screw device, thejacket also having a second opening forthe circulation of water to and from said jacket, said tool comprisingconnected first and second arms, the first arm being adapted toextendinto the second opening in the jacket and being provided with a recessadapted to receive the rounded inner end of the heat indicator bulb, thesecond arm being adapted to be disposed outside the jacket and having abifurcated end adapted to straddle a tube leading from the outer. end ofthe bulb and being arranged at an angle to said first arm and in line ofmovement of the screw device, which, when unscrewed will apply pressureagainst the second arm, said bifurcated end of the second arm and therecess in said first arm being in alignment, whereby the pressureappliedv against the second arm will be transferred through said firstarm against the inner end of the bulb in a direction coincident with thelongitudinal axis of the bulb.

2. A tool of the character described for removing heat indicator bulbsof the type arranged in an opening in a water jacket or the "like andheld by a screw device, the jacket also having a second opening for thecirculation of water to and from said jacket, said tool comprisingpivotally connected arms, one arm being adapted to extend into thesecond opening in the jacket and being provided between its end and thepoint of pivottransmitting said pressure from the second arm to thefirst arm for moving the recessed portion of the first arm toward thebifurcated portion of the second arm.

3. A tool of the character described for removing heat indicator bulbsof the type arranged in an opening in a water jacket or the like andheld by a screw device, the jacket also having a "second opening for thecirculation of water to and from said jacket, said tool comprisingpivotally connected arms, one arm being adapted to extend into thesecond opening in the jacket and beingprovided between its end and thepoint of pivoting with a recess adapted to receive the inner end of aheat indicator bulb, the other arm being adapted to be disposed outsidethe jacket and being bifurcated at a point remote from the point ofpivoting, said bifurcated end being adapted to straddle a tube leadingfrom the other end of the bulb and being in line of movement of thescrew device, which, when unscrewed will apply pressure against thesecond arm in a direction away from the first arm, and adjustable meanscarried by one arm and bearing against the other arm for transmittingsaid pressure from the second arm to the first arm for moving therecessed portion of the first arm toward the bifurcated portion of thesecond arm.

4. A tool of the character described for removing heat indicator bulbsof the type arranged in an opening in a water jacket or the like andheld by aretaining nut, the jacket also having a second opening for thecirculation of water to and from said jacket, said tool comprisingpivotally connected arms, one arm being adapted to extend into thesecond opening in the jacket and being provided between its end and thepoint of pivoting with a recess adapted to receive the inner end of theheat indicator bulb, the other arm being adapted to be disposed outsidethe jacket and being bifurcated at a point remote from the point ofpivoting, said bifurcated portion of the second arm .being adapted tostraddle a tube leading from the other end of the bulb and to contactthe outer surface of the bulb retaining nut, which, when unscrewed willapply pressure against the second arm in a direction away from the firstarm, said second arm having a projection thereon, adjacent itsbifurcated portion, adapted to fit between the inner surface of a holein the retaining nut and the tube, and means arranged at the point ofpivoting of said arms for transmitting said pressure from the second armto the first arm for moving the recessed portion of the first arm towardthe bifurcated portion of the second arm.

- BASIL PAUL STRONG.

